'The Big Bang Theory': 'The Holographic Excitation'

Wolowitz (Simon Helberg, left) and Bernadette (Melissa Rauch, right), dress up as Smurf and Smurfette for a Halloween party at Stuart's comic book store.Airs: Thursday, Oct. 25 at 8 p.m. ET/PT on CBS.

Wolowitz (Simon Helberg, left) and Bernadette (Melissa Rauch, right), dress up as Smurf and Smurfette for a Halloween party at Stuart's comic book store.Airs: Thursday, Oct. 25 at 8 p.m. ET/PT on CBS. (CBS)

Wolowitz (Simon Helberg, left) and Bernadette (Melissa Rauch, right), dress up as Smurf and Smurfette for a Halloween party at Stuart's comic book store.Airs: Thursday, Oct. 25 at 8 p.m. ET/PT on CBS.